Thermophysical properties of (La0.25Sm0.25Gd0.25Yb0.25)2Ce2+xO7+2x(x=0.1, 0.2, and 0.3) high entropy oxides |
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Affiliation: | 1. School of Mechanical Engineering, Henan University of Engineering, Zhengzhou, 451191, China;2. School of Construction Engineering, Henan University of Engineering, Zhengzhou, 451191, China |
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Abstract: | A series of high-entropy oxides (La0.25Sm0.25Gd0.25Yb0.25)2Ce2+xO7+2x were synthesised adopting a improved sol-gel technique and fritting method. The crystal-lattice, microstructure, elemental constitution, and thermal-physical performances were studied. The results showed that the synthesised high-entropy oxides have a single-fluorite lattice structure. The bulk specimen exhibits a compact microstructure, and clear grain boundaries. The thermal conductivities of the obtained high-entropy oxides are lower than those of CeO2 and 7YSZ due to lattice strains and numerous oxygen vacancies. The obtained high-entropy oxides have greater thermal expansion coefficients than 7YSZ. The thermal conductivity and expansion coefficient are elevated because of the addition of excess CeO2. The synthesised high-entropy oxides also exhibit outstanding lattice steadiness up to 1200 °C. |
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Keywords: | High-entropy ceramics Thermophysical properties Lattice stability |
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